Musical Car Horn with Keypad Selection

Hi! I'm looking to take a list of arduino songs and turn them into a numbered list that you can punch into a keypad to select the song you want to play, and then it will play into speaker that will be mounted under my hood. That way, when my mother-in-law comes out of the house, I can play the Imperial Death March. I found some good content on wiring up to the car 12v port to an AMP, and speaker, etc. I've even got the arduino blasting tunes in an emulator. What I probably need help with, how do I (high-level) catalog the songs into a list, and write something that will allow me to punch in a number to play the corresponding song? I'll probably through a tiny LCD that shows what selection was made, etc.

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